docs: def collection(self, code):
          """
          Retrieve the collection ids according to the given 3 letters acronym
          """
          url = urljoin(self.ARTICLEMETA_URL, self.COLLECTION_ENDPOINT)
  
          params = {'code': code}
  
          result = self._do_request(url, params=params)
  
          if not result:
              return None
  
          return result